Mining tool



P. W. HURLEY MINING TOOL Oct. 4, 1932.

2 Sheets'fSheet l Filed Oct. 3.0.r 1951 INVENTOR PM ATTORNEYS OCI. 4, 1932. P W. HURLEY 1,880,252'

MINING TOOL Filed Oct. 50, 1931 2 Sheets-Sheet 2 INVENTOR l ya' WzzrZey ATTORNEY Patented Oct. 4, 1932 PERGY W. HURLEY, OF SHARON HILL, PENNSYLVANIA MINING TOOL Appneation mea october 30.1931.

This invention relates to improvements in mining tools and aims to provide a simple, compact, and yet effective means for positively and forcibly urging the cutter bits into engagement with the work.

While not limited thereto, the invention is particularly useful for use in connection with coal mining operations.

A characteristic feature of the invention 1o resides in the fact that means are provided whereby the force exerted in pulling the cutter frame across the coal face is utilized to move jaw members relatively to the cutter supporting frame so that suitably inclined teeth on these jaw members cut into the kerf made by the cutter, the inclination vof the teeth being such that the frame and cutter vbits supported thereby are forcibly urged toward and into cutting engagement with the work.

The above and further features of the invention will be fully apparent from the following specification when read in connection with the accompanying drawings and will be defined with particularity in the appended claims.

In the drawings Fig. l is a horizontal section through a portion of a coal mine illustrating in a general way the application of my improved mining tool to a coal mining operation;

Fig. 2 is a side elevation of a cutter illusn trating one embodiment of the invention;

Fig. 2c is an end view taken from the left 35 side of Fig. 2; Y

Fig. 3 is a plan view of Fig. 2;

Fig. 3a is a transverse section on line 3ft-3a of Fig. 3;

Fig. l is a longitudinal section on line 4 4 of Fig. 3;

Fig. 5 is a transverse section on line 5 5 Of Fig. 4.

Referring in detail to the drawings, A represents a body of coal which is to be undercut. For this purpose, I use one or more of my improved mining tools which in Fig. l are indicated as a whole at B-B. These tools are connected at their ends to a cable C. The cable C passes around suitable guide UU sheaves, indicated at D, these sheaves being Serial No. 572,023.

adjustably fastened to any suitable support, such as indicated at C2 secured to respective entries in the mine. As indicated in Fig. l particularly, the cable C is capable of being propelled in reverse directions by a known '55 typ; of winch or winding drum, indicated A characteristic feature of the invention resides in the combination of the cable and its moving means with a cutter having ex- '69 pansible parts which are adapted to engage the lrerf cut by the device and to cause the cutter bits to be forcibly pressed, Vor urged toward' and into cutting engagement with `the work. A further novel characteristic '[55 feature of the invention resides in the provision of frame with a draw bar adapted to be fastened to the cable and mounted for movement relatively to the frame, this bar coacting with wedge or cam-lilre members 7@ for expanding jaws which carry teeth inclined in a direction at an angle to the line of travel of the cutters, the teeth being adapted to bite into the opposite wallsof the lerf so that as the cutter device is pulled by the cable and Winch mechanism, the pulling force will be in part resolved into a component force tending to force the cutters into cutting engagement with the work.

The improved cutter includes a plurality "30 of cutter bits G secured in suitable sockets Aformed in a frame member H. The frame K, these being inclined at anv angle to the S5 line of travel of the device as a whole, as indicated in Fig. 3.

A draw bar L extends longitudinally of the frame H and slidably engages suitable bearings formed therein, the bar being'ar- 9G ranged to partake of a slight relative movement with respect to' the frame H when a pulling force is exerted on the cable C. The draw bar carries, at each end, eye-fittings L', which are keyed to the bar as shown. "95 These fittings form a convenient means for attaching the actuating cable C. As indicated in detail in Figs. 4 and 5, near each end, the draw bar carries a wedge-like member M which is `secured thereto by a key'm. 1U@

The expansible jaws J-J have secured thereto inwardly extending lugs N provided with wedge or cam faces n adapted to coact with complementary wedge faces m of the wedge block M. The block M is provided with an elongated hub O which provides an ample bearing on the draw bar L. The outer faces a of the lugs N coact with the inner wall surface 7L of the frame H, as indicated in Fig. 4.

The jaws are also provided with inwardly extending guide lugs P, whose surfaces p coact with the inner surface 7L of the frame H. As thus arranged, it is clear that when a pulling force is exerted on the draw bar, the wedge M coacting with the wedge-like lugs N of the aws J will expand the latter. Thus the teeth K will bite into the upper and lower walls of the lerf. The inclination of the teeth with relation to the line of travel of the cutting device as a whole is such that their tendency is to force the cutter bits into cutting engagement with the work. Thus it is clear that the pulling force exerted by the cable C through the draw bar is resolved in part into a component force tending to urge the cutter'bits toward the work.

The frame H of the jaws J, in some cases, will be made of strong castings 0r forgings. The teeth K are preferably of hardened steel or other material having adequate wear-resisting characteristics. For this reason, it is desirable in some cases to have teeth removably mounted, for example, by seating them in dove-tailed grooves, as shown in Fig. 5. For normally holding the teeth in their operative position, I provide a removable stop piece or locking bar Q, seated in a suitable groove in the jaw and held in place by flush head screws R. As thus arranged, the teeth may be readilyreplaced when worn or can be removed for grindingr or sharpening.

From the foregoing, it will be clear that the improved cutter is extremely compact in design, rugged in construction and provides means whereby a pull on the cable will expand the jaw members which in turn are effective through the inclined teethl carried thereby to forcibly press cutter bits against the work and thereby augment the cutting action.

While I have described with great particularitythe design and construction of a preferred embodiment ofthe invention illustrated, it is not to be construed that I am limited thereto since various modifications and substitutions of equivalents may be made by those skilled in the art and it is intended' ,for pulling it, of a cutting device moved by the cable comprising a frame with cutter bits carried thereby, a member secured to said cable movable relatively to said frame, toothed means carried by said frame adapted to force said bits into cutting engagement with the work cut by said cutter bits, and

means responsive to relative movement between said member and the frame effective to force said toothed means into engagement with opposite walls of said kerf.

2. A device of the character described comprising a frame carrying cutter bits adapted to cut a kerf in a seam of coal or the like, expanding jaws, a bar for transmitting bodily movement to said frame, coacting means on the bar and said jaws for expanding the latter and teeth on said jaws inclined'at an angle to influence the cutting action of said cutter bits.

3. A device of the character described comprising a frame carrying cutter bits adapt/ed to cut a kerf in a seam of coal or the like, expanding jaws guided in said frame and having inclined teeth, a draw-bar slidable to a limited extent relatively to said frame and respective coacting wedge members carried by the draw-bar and said jaws.

4. A device of the class described comprising a frame having movable jaws carried thereby, cutter bits carried by the frame, a draw bar, mea-ns carried thereby tending to spread said jaws, and teeth secured to said jaws and inclined at such an angle that movement of the frame urges said cutter bits into engagement with the work.

5. A device of the class described comprising a frame, cutter bits carried by the frame, a draw bar movable relatively to the frame, jaws movable relatively to the frame and coacting means on said draw bar and said jaws whereby movement of the draw bar relatively to the frame moves said jaws, and teeth secured to said jaws disposed at an angle to the longitudinal axis of said draw bar and adapted to urge said cutter bits toward the work when a driving force is applied to said draw bar.

6. A device of the class described comprising a fra-me carrying cutter bits, a draw bar slidably mounted in the frame, jaws guided in the frame and having teeth inclined at an angle to the line of travel of the cutter bits, and means secured to the draw bar for expanding said jaws.

7. A device of the class described comprising a frame carrying cutter bits, a draw bar slidably mounted in the frame, aws guided in the frame and having teeth inclined at an angle to the line of travel of the cutter bits, wedge-like lugs secured to said jaws and a wedge-like spreader secured to said draw bar coacting with said lugs.

In witness whereof, I have hereunto signed my name.

PEROY W. HURLEY. 

